Wheel and Tyre sizes

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Wheel and Tyre sizes

Postby Simmo » Sat Jul 30, 2011 9:06 pm

I'm confused. Trying to buy tyres online but what size do I need? My wheels have the size 622x15C printed on them. The tyres are available in 700x23, 700x25 or 700x28. Internet searches all produce Sheldon Brown's tyre sizing guide, which is totally unhelpful to me.

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Re: Wheel and Tyre sizes

Postby Nobody » Sat Jul 30, 2011 9:21 pm

It really depends to some degree on what conditions you'll use the bike for and how much you weigh. All these tyres will fit the wheels specified, it is just the bigger sizes handle weight better and protect your rims better over rough ground. Another issue is whether the tyre will fit in the frame. 28s may not fit in some road bike frames.

Keep in mind that different tyre sizes require different pressure depending on individual wheel weight. This is necessary to get the best suspension effect versus roll.

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Re: Wheel and Tyre sizes

Postby sblack » Sat Jul 30, 2011 9:24 pm

622x15C is a pretty standard sized road rim. The most common tyre size fitted is probably a 700x23 but you could likely fit anywhere from a 700x19 through to a 700x25 without issue (the second number is the width in millimetres). A 700x28 would go fine on the rim but it's at that point that road bikes can start having issues with tyre clearance so your frame would determine if that would still work for you. What sort of riding is it for? For general road riding most seam to chose 700x23 but if you ride on rougher roads or are after more comfort or don't ride particularly fast (above say 40km/h regularly) then you may be better off with a wider tyre. Of course being the more common size it tends to be the 700x23 tyres that have specials more often.

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Re: Wheel and Tyre sizes

Postby Robdog » Tue Aug 09, 2011 9:06 pm

622 is the ISO designation for 700c bead diameter, then the smaller number (19-50+) is the width of the tyres in mm. Road bikes typically run between 19 and 25mm tyres, 23's are most common
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